Alert archive / Indiana / Mesoscale Discussions in 2003

Mesoscale Discussion 930

May 10, 20034 counties in Illinois; 45 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at May 10, 2003, 8:41 PM CDT for 4 counties in Illinois; 45 counties in Indiana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 10, 2003, 8:41 PM CDT (01:41 UTC)
Expired
May 10, 2003, 10:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 49 counties

Crawford County, IL, Lawrence County, IL, Richland County, IL, Wabash County, IL, Bartholomew County, IN, Boone County, IN, Brown County, IN, Clay County, IN, Crawford County, IN, Daviess County, IN, Decatur County, IN, Delaware County, IN, Dubois County, IN, Fayette County, IN, Franklin County, IN, Gibson County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Pike County, IN, Putnam County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Sullivan County, IN, Tipton County, IN, Union County, IN, Vigo County, IN, Warrick County, IN, Washington County, IN, Wayne County, IN

The radar

The Indianapolis radar (KIND), 57 km from the middle of the area, began a volume at 01:43 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 1.7 hours before the alert went out and 210 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Cncnati-Daytn, OH at 00:00Z on 2003-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1265 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cncnati-Daytn, OH at 00:00Z on 2003-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 411 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1265 J/kg
Mixed-layer CIN
-64 J/kg
Mixed-layer LCL
897 m above ground
0-6 km bulk shear
71 kt
0-1 km storm-relative helicity
411 m²/s²
0-3 km storm-relative helicity
392 m²/s²
Significant tornado parameter
3.2
Supercell composite
17.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
ACUS11 KWNS 110142
SWOMCD
SPC MCD 110141 
OHZ000-INZ000-KYZ000-ILZ000-110345-

MESOSCALE DISCUSSION 0930
NWS STORM PREDICTION CENTER NORMAN OK
0841 PM CDT SAT MAY 10 2003

AREAS AFFECTED...SERN IL THROUGH CNTRL/SRN IND

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 110141Z - 110345Z

THREAT FOR DAMAGING WIND...LARGE HAIL AND ISOLATED TORNADOES
EXPECTED TO INCREASE EWD TOWARD IND NEXT FEW HOURS. WW WILL LIKELY
BE NEEDED WITHIN THE HOUR.

LOW LEVEL JET WILL CONTINUE TO STRENGTHEN THIS EVENING IN RESPONSE
TO DEEPENING SURFACE LOW OVER THE UPPER MS VALLEY...CONCURRENT WITH
APPROACHING MID/UPPER JET. THIS WILL MAINTAIN STRONG SHEAR PROFILES
FOR SUPERCELLS OVER THE OH VALLEY. STORMS DEVELOPING UPSTREAM OVER
IL EXPECTED TO CONTINUE DEVELOPING EWD INTO CNTRL/SRN IND WHERE THE
ATMOSPHERE REMAINS MODERATELY UNSTABLE.

..DIAL.. 05/11/2003

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...ILN...LMK...IWX...IND...PAH...ILX...

38748522 37968731 38598816 39958734 40498565 39898465

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 10, 7:06 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Hardin, Jackson, Johnson, Massac and 7 more54 min
May 10, 8:05 PM CDTTornado WatchSPCBoone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more6 hr
May 10, 8:18 PM CDTMesoscale DiscussionSPCBureau, Carroll, Henderson, Henry, Jo Daviess, Knox and 8 more117 min
May 10, 8:45 PM CDTTornado WatchSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more5 hr
May 10, 9:10 PM CDTTornado WatchSPCAdams, Bond, Brown, Calhoun, Cass, Champaign and 45 more5 hr
May 10, 9:35 PM CDTTornado WatchSPCBureau, Carroll, Henderson, Henry, Jo Daviess, Knox and 11 more3 hr
May 10, 10:56 PM CDTMesoscale DiscussionSPCBoone, Bureau, Cook, DeKalb, DuPage, Ford and 19 more94 min
May 11, 1:46 AM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Champaign and 42 more89 min
May 10, 10:40 PM CDTMesoscale DiscussionSPCDeKalb, Elkhart, Kosciusko, LaGrange, LaPorte, Marshall and 5 more2 hr
May 10, 11:00 PM CDTTornado WatchSPCAdams, Allen, Cass, DeKalb, Elkhart, Fulton and 15 more6 hr
May 10, 11:20 PM CDTTornado WatchSPCHarrison, Perry, Spencer6 hr
May 10, 11:28 PM CDTMesoscale DiscussionSPCDearborn, Fayette, Franklin, Jay, Ohio, Randolph and 4 more2 hr

Nearby

Mesoscale Discussions in Indiana, 2003Mesoscale Discussions in Illinois, 2003Every mesoscale discussion in 2003

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.